While campaigning in New York, Claire Underwood bumps into Frank’s schoolmate Ken Caswell, who asks if she has “heard about Tim”.
Tim Corbet is another old friend of Frank’s, who Claire is shocked to hear is missing and presumed dead in a white water rafting accident.
Ken apologises for breaking the bad news, and tells Claire: “I can’t imagine how Frank’s gonna take this. Frank and Tim’s relationship was special.”
Claire is confused by his words and later interrogates Ken on the subject.
He tells her: “Frank worshipped [Tim], would have done anything for him. If the world were a different place back then, who knows.”
Attentive fans will remember Tim from season one, episode eight of House of Cards.
He was introduced as one of Frank’s military school friends who he meets again at the opening of the Francis J Underwood library.
Frank, Tim, Ken and another friend named Phil enjoyed an alcohol-fuelled night and reminisced about their glory days as a barbershop quartet.
House of Cards: Frank Underwood reminisced with Tim Corbet in season one
House of Cards: Tim Corbet first appeared in season one
At the end of the night Frank and Tim find themselves alone, and it is heavily implied that the two men had an affair during their school days.
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I was so drawn to you
Frank Underwood to Tim Corbet
Frank says: “We were so close. I was so drawn to you.”
“We were kids Frank,” Tim replied.
“We messed around a couple of times. It made me happy to make you happy, didn’t see any harm in it.”
Tim went on to marry and have children. Frank settled down with Claire, but throughout the series has shown that his sexuality remains fluid.
House of Cards: Frank went on to marry Claire House of Cards: Most shocking moments Tue, February 7, 2017
House of Cards: Here are Frank and Claire's most shocking moments.
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The most shocking moments in Netflix drama House of Cards
In one of the show’s most memorable scenes, Frank enjoyed a threesome with his wife and their bodyguard Edward Meechum.
In season three, Frank grew close to biographer Thomas Yates.
In a sexually-charged scene Thomas placed his hand on Frank’s chest, but Frank recoiled.
Thomas later began an affair with Claire (with Frank’s consent) which promises to be a major part of season five.
House of Cards season 5 is available on Netflix now.